No harm no foul--he's offering refunds or replacement keys--but I am surprised that they wouldn't just hire a port studio to do this. I get why they can't do the port, I get why Game Maker's maker can't do the port. That makes tons of sense. But I'm surprised there's not an outsourcing dev that could make this work economically for them. I would expect you could do it for high five figures low six and that it'd be marginally profitable. Whatever, though, the worst harm done is a broken heart for anyone who wanted it on Wii U or Vita.
Side note: a lot of KSes from 2013-2014 that ran into delays and extended development are facing the prospect of cancelling Xbox 360, PS3, Vita, 3DS, or Wii U ports. I think this maybe should be a thoughtful lesson for people considering backing anything; if the game gets delayed by 2 years, will the platform you backed it for still exist? And if not, will you move on? Because if you won't, you probably shouldn't back the project at all. HLD did well enough that they can refund these backers, but some devs can't or won't. Caveat emptor!
I mean, yes, but also who was hurt by this?